Dual marking gauge



FIG. 1 is a top, front, and left side perspective view of the dual marking gauge of this invention.

FIG. 2 is a bottom plan view of the design for the dual marking gauge shown in FIG. 1.

FIG. 3 is a right side view of the design for the dual marking gauge shown in FIG. 1.

FIG. 4 is a left side view of the design for the dual marking gauge shown in FIG. 1.

FIG. 5 is a front elevation view of the dual marking gauge shown in FIG. 1; and,

FIG. 6 is a rear elevation view of the dual marking gauge shown in FIG. 1. 

The ornamental design for dual marking gauge, as shown and described. 